Does this calculator diagnose growth issues?

No. It only classifies percentiles. A pediatrician must evaluate health conditions.

Are WHO growth standards accurate?

WHO standards are widely used internationally for children aged 0–5 years.

Is my baby’s information saved?

No. All calculations are local and private.

Baby Growth Calculator

Q: What is a growth percentile?

Percentiles compare a baby’s weight or height to WHO growth standards for the same age.

Estimate your baby's growth percentile using weight and height based on WHO growth reference ranges for 0–24 months.

Age (months)

Weight (kg)

Height (cm)

How the Baby Growth Calculator Works

The Baby Growth Calculator helps parents understand how their baby's weight and height compare to standard growth patterns for infants between 0 and 24 months. Growth percentiles are widely used in pediatric health assessments and provide an easy way to see whether a baby's growth is within typical ranges. Percentiles do not measure intelligence, health, or development — they only compare size relative to a global reference population.

This calculator uses approximate WHO growth chart ranges, which are trusted internationally for assessing infant growth. The system works by comparing your baby's weight and height to values at key ages such as 0, 6, 12, 18, and 24 months. The calculator then determines whether your baby falls below the 5th percentile, between 5th and 25th, between 25th and 50th, between 50th and 75th, or above the 75th percentile. These categories help identify patterns such as slow growth, steady progress, or rapid physical development.

Each baby grows differently, and many healthy infants fall outside the “average” range. Genetics, feeding habits, birth weight, and overall health can all impact growth rate. This calculator is intended for general guidance and should not replace professional pediatric advice. If you notice sudden changes in growth or have concerns, consulting a pediatrician is always recommended.

All calculations run locally in your browser, and no data is saved or transmitted. The tool is fast, private, and ideal for parents who want quick insights into growth trends anytime.

Frequently Asked Questions

What is a growth percentile?

A percentile shows how your baby's size compares to a reference population of the same age.

Are percentiles a medical diagnosis?

No. They are only indicators. A doctor must evaluate growth medically.

Are WHO charts reliable?

WHO growth standards are widely used worldwide for children 0–5 years.

Is my baby's data stored?

No. All calculations happen locally in your browser.